Graduated Pyrex® Media Bottle, 1,000mL, Low Actinic, GL-45 . Bottles are provided with enhanced graduation scale, orange polypropylene cap and drip-free pour ring included. 1000 mL Low Actinic Media Bottle with GL-45 Screw Cap. ideal for media, buffers, aqueous, and nonaqueous solutions, this Heavy Duty bottle of low actinic glass for use when storing/transporting light sensitive materials.